Enable generating legacy IT block for AArch32

By default, the behavior of IT block generation will be determinated
dynamically base on the arch (armv8 vs armv7). This patch adds backend
options: -arm-restrict-it and -arm-no-restrict-it.  The former one
restricts the generation of IT blocks (the same behavior as thumbv8) for
both arches. The later one allows the generation of legacy IT block (the
same behavior as ARMv7 Thumb2) for both arches.

Clang will support -mrestrict-it and -mno-restrict-it, which is
compatible with GCC.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194592 91177308-0d34-0410-b5e6-96231b3b80d8

9 files changed, 15 insertions, 2 deletions

diff --git a/test/CodeGen/ARM/2013-05-05-IfConvertBug.ll b/test/CodeGen/ARM/2013-05-05-IfConvertBug.ll
index 2bebcf4..c4f5f54 100644
--- a/test/CodeGen/ARM/2013-05-05-IfConvertBug.ll
+++ b/test/CodeGen/ARM/2013-05-05-IfConvertBug.ll
@@ -1,5 +1,6 @@
 ; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a8 | FileCheck %s
 ; RUN: llc < %s -mtriple=thumbv8 | FileCheck -check-prefix=CHECK-V8 %s
+; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck -check-prefix=CHECK-V8 %s
 ; rdar://13782395
 
 define i32 @t1(i32 %a, i32 %b, i8** %retaddr) {
diff --git a/test/CodeGen/Thumb2/thumb2-ifcvt1.ll b/test/CodeGen/Thumb2/thumb2-ifcvt1.ll
index 85943cf..13a1ca2 100644
--- a/test/CodeGen/Thumb2/thumb2-ifcvt1.ll
+++ b/test/CodeGen/Thumb2/thumb2-ifcvt1.ll
@@ -1,5 +1,6 @@
 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
-
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -arm-default-it | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv8 -arm-no-restrict-it |FileCheck %s
 define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
 ; CHECK-LABEL: t1:
 ; CHECK: ittt ne
@@ -74,7 +75,7 @@ entry:
 ; CHECK-LABEL: t3:
 ; CHECK: itt ge
 ; CHECK: movge r0, r1
-; CHECK: blge  _foo
+; CHECK: blge  {{_?}}foo
 	%tmp1 = icmp sgt i32 %a, 10		; <i1> [#uses=1]
 	br i1 %tmp1, label %cond_true, label %UnifiedReturnBlock
 
diff --git a/test/CodeGen/Thumb2/thumb2-ifcvt2.ll b/test/CodeGen/Thumb2/thumb2-ifcvt2.ll
index 788fa06..403cd48 100644
--- a/test/CodeGen/Thumb2/thumb2-ifcvt2.ll
+++ b/test/CodeGen/Thumb2/thumb2-ifcvt2.ll
@@ -1,4 +1,6 @@
 ; RUN: llc < %s -mtriple=thumbv7-apple-ios | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-default-it | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv8-apple-ios -arm-no-restrict-it | FileCheck %s
 
 define void @foo(i32 %X, i32 %Y) {
 entry:
diff --git a/test/CodeGen/Thumb2/thumb2-ifcvt3.ll b/test/CodeGen/Thumb2/thumb2-ifcvt3.ll
index bcf10ef..a71aa3f 100644
--- a/test/CodeGen/Thumb2/thumb2-ifcvt3.ll
+++ b/test/CodeGen/Thumb2/thumb2-ifcvt3.ll
@@ -1,4 +1,6 @@
 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -arm-default-it | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv8-apple-darwin -arm-no-restrict-it | FileCheck %s
 
 ; There shouldn't be a unconditional branch at end of bb52.
 ; rdar://7184787
diff --git a/test/CodeGen/Thumb2/v8_IT_1.ll b/test/CodeGen/Thumb2/v8_IT_1.ll
index 9248378..30dbb48 100644
--- a/test/CodeGen/Thumb2/v8_IT_1.ll
+++ b/test/CodeGen/Thumb2/v8_IT_1.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=thumbv8 -mattr=+neon | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7 -mattr=+neon -arm-restrict-it | FileCheck %s
 
 ;CHECK-LABEL: select_s_v_v:
 ;CHECK-NOT: it
diff --git a/test/CodeGen/Thumb2/v8_IT_2.ll b/test/CodeGen/Thumb2/v8_IT_2.ll
index fe88316..170b413 100644
--- a/test/CodeGen/Thumb2/v8_IT_2.ll
+++ b/test/CodeGen/Thumb2/v8_IT_2.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=thumbv8 | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck %s
 
 	%struct.quad_struct = type { i32, i32, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct* }
 
diff --git a/test/CodeGen/Thumb2/v8_IT_3.ll b/test/CodeGen/Thumb2/v8_IT_3.ll
index 4d90891..4dca246 100644
--- a/test/CodeGen/Thumb2/v8_IT_3.ll
+++ b/test/CodeGen/Thumb2/v8_IT_3.ll
@@ -1,5 +1,7 @@
 ; RUN: llc < %s -mtriple=thumbv8 | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck %s
 ; RUN: llc < %s -mtriple=thumbv8 -relocation-model=pic | FileCheck %s --check-prefix=CHECK-PIC
+; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it -relocation-model=pic | FileCheck %s --check-prefix=CHECK-PIC
 
 %struct.FF = type { i32 (i32*)*, i32 (i32*, i32*, i32, i32, i32, i32)*, i32 (i32, i32, i8*)*, void ()*, i32 (i32, i8*, i32*)*, i32 ()* }
 %struct.BD = type { %struct.BD*, i32, i32, i32, i32, i64, i32 (%struct.BD*, i8*, i64, i32)*, i32 (%struct.BD*, i8*, i32, i32)*, i32 (%struct.BD*, i8*, i64, i32)*, i32 (%struct.BD*, i8*, i32, i32)*, i32 (%struct.BD*, i64, i32)*, [16 x i8], i64, i64 }
diff --git a/test/CodeGen/Thumb2/v8_IT_4.ll b/test/CodeGen/Thumb2/v8_IT_4.ll
index 45c79f4..5a80d8c 100644
--- a/test/CodeGen/Thumb2/v8_IT_4.ll
+++ b/test/CodeGen/Thumb2/v8_IT_4.ll
@@ -1,5 +1,7 @@
 ; RUN: llc < %s -mtriple=thumbv8-eabi -float-abi=hard | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-eabi -float-abi=hard -arm-restrict-it | FileCheck %s
 ; RUN: llc < %s -mtriple=thumbv8-eabi -float-abi=hard -regalloc=basic | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-eabi -float-abi=hard -regalloc=basic -arm-restrict-it | FileCheck %s
 
 %"struct.__gnu_cxx::__normal_iterator<char*,std::basic_string<char, std::char_traits<char>, std::allocator<char> > >" = type { i8* }
 %"struct.__gnu_cxx::new_allocator<char>" = type <{ i8 }>
diff --git a/test/CodeGen/Thumb2/v8_IT_5.ll b/test/CodeGen/Thumb2/v8_IT_5.ll
index 3866068..30250c8 100644
--- a/test/CodeGen/Thumb2/v8_IT_5.ll
+++ b/test/CodeGen/Thumb2/v8_IT_5.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=thumbv8 | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck %s
 ; CHECK: it	ne
 ; CHECK-NEXT: cmpne
 ; CHECK-NEXT: beq